CVE-2026-97955
UnknownSummary
In the Linux kernel, the mana driver has an issue with the XDP program pointer. When RX buffer pre-allocation fails, mana_xdp_set() returns an error without restoring the previous pointer, leading to use-after-free. The fix restores the previous program on the error path.
Risk Assessment
Use-after-free can lead to system crash, malfunction, or potential privilege escalation. The issue is reachable via a normal ip link set xdp command when buffer allocation fails.
Recommendation
Apply a Linux kernel update containing the fix for the mana driver. Monitor RX buffer allocations to avoid error conditions.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: mana: restore the XDP program pointer when pre-allocation fails mana_xdp_set() publishes the new program into apc->bpf_prog before it allocates anything, because mana_pre_alloc_rxbufs() sizes the buffers from it via mana_get_rxbuf_cfg(). When that allocation fails the function returns the error directly, skipping the err_dealloc_rxbuffs label which is the only place that restores the previous pointer. The attach is reported as failed, so the BPF core drops the reference it held for the caller and the program can be freed, while apc->bpf_prog still points at it. The next consumer of mana_xdp_get() - typically mana_chn_setxdp() from mana_alloc_queues() on the following ifup, or after a TX timeout reset - then calls bpf_prog_add() on freed memory. This is reachable from an ordinary "ip link set dev ethX xdp obj ..." whenever the per-queue RX buffer pre-allocation cannot be satisfied. Restore the previous program on that error path.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS